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"Self-education is, I firmly believe, the only kind of education there is."
- Isaac Asimov

Veridicator  
  A device that measured physiologic responses (biometric data) and translated it to a set of colors that unerringly reported whether or not the measured person was telling the truth.  

This forgotten gem of a novel from the 1960's makes good use of a machine that unerringly tells whether or not the person believes what he or she is saying. The notion of dealing truthfully with yourself and your society is an important theme in the novel, and is an important idea for us in our world today.

There was a bright conical helmet on his head, and electrodes had been clamped to various portions of his anatomy. On the wall behind him was a circular screen which ought to have been a calm turquoise blue, but which was flickering from dark blue through violet to mauve. That was simple nervous tension and guilt and anger at the humiliation of being subjected to veridicated interrogation.
From Little Fuzzy, by H. Beam Piper.
Published by Doubleday in 1962
Additional resources -

Would you behave differently if you knew that, at need, you could be veridicated? Would you live your entire life differently, if you knew that people could tell, without fail, whether or not you believed what you said? I think that the author believed that a life lived truthfully was a better life, and a more sentient, more civilized life.

Compare to the psychoprobe from Satellite Five (1938) by Arthur K. Barnes, the mechanical judge from The Lord of Tranerica (1939) by Stanton A. Coblentz, the quizzer from Agent of Vega (1949) by James Schmitz, the psychic probe from Foundation and Empire (1952) by Isaac Asimov, the truth meter from The Star Beast (1954) by Robert Heinlein and the cephaloscope from The Houses of Iszm (1954) by Jack Vance.

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Additional resources:
  More Ideas and Technology from Little Fuzzy
  More Ideas and Technology by H. Beam Piper
  Tech news articles related to Little Fuzzy
  Tech news articles related to works by H. Beam Piper

Veridicator-related news articles:
  - Blob Analysis Key To Next Generation Computerized Lie Detectors
  - Cheaters May No Longer Prosper

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